Compare experts › Rangan Chatterjee vs Bryan Johnson

Rangan Chatterjee vs Bryan Johnson

Rangan Chatterjee (doctor, former nhs gp) and Bryan Johnson (entrepreneur, founder of blueprint) side by side: how they train, eat, supplement and sleep, how strong the evidence is, and how to build a plan from either or both.

Build a plan from bothSee the protocols
Words explained (11)
Zone 2
Steady cardio at a pace where you can still talk in full sentences, but not sing.
Intervals
Short hard efforts with easy recovery in between, such as 30 seconds fast, 90 seconds slow.
4 × 4
Four rounds of 4 minutes hard with 3 minutes easy in between. Also called Norwegian intervals.
Loaded carry
Walking while holding something heavy, like shopping bags or dumbbells.
Mobility
Moving your joints freely through their full range.
Creatine
A well-studied supplement that supports strength and muscle.
Omega-3 (EPA, DHA)
Healthy fats found mostly in oily fish such as salmon, herring and sardines.
Fibre
The part of plant foods you don't digest. It feeds healthy gut bacteria and keeps you full.
Time-restricted eating
Eating all your meals within a set window of the day, for example 8am to 6pm.
Glucose
Blood sugar.
Rapamycin, metformin
Prescription drugs that some experts take hoping to slow ageing. Not proven for that, and never part of your plan.

At a glance

MeasureRangan ChatterjeeBryan Johnson
BackgroundDoctor, former NHS GPEntrepreneur, founder of Blueprint
Training split30% strength · 50% aerobic · 15% intervals · 5% mobility30% strength · 40% aerobic · 20% intervals · 10% mobility
Signature habitRelax · eat · move · sleepSleep-first, measure everything
ProteinNo fixed target~130 g a day
Training styleLifestyleMeasure everything
Overall evidenceSolidMixed
FollowingInstagram 1.7M · YouTube 1.4MInstagram 2.8M · YouTube 2.2M

Training splits are our estimates from each expert’s published routine. Following checked October 2026.

The key differences

  • Chatterjee puts more of the week into aerobic base (zone 2): about 50% against 40%.
  • In plans in their style, Chatterjee's hard sessions are 1-minute intervals; Johnson's are 4-minute intervals (Norwegian 4 × 4).
  • We rate the evidence behind Chatterjee's protocol higher: solid, against mixed for Johnson.
  • Supplements that go into a plan: Chatterjee, none (food first); Johnson, creatine monohydrate, omega-3. Prescription items and personal stacks stay out of every plan.
  • Both include their own mobility or movement routine.

Protocols side by side

Each line is rated for the evidence behind it. “Doctor only” items never go into a plan.

Training

Rangan Chatterjee

  • Walk at least 10,000 steps a daySome evidence
  • Strength training twice a weekStrong evidence
  • Short daily glute exercises (e.g. hip extensions), a couple of minutesPersonal habit
  • Five-minute home workout: five moves back to back, 20 s on / 40 s off for beginners or 40 s on / 20 s off for advanced, five roundsSome evidence
  • Swap any move that is too hard, painful or unsafeNote

Bryan Johnson

  • About 150 minutes a week of moderate cardio (Zone 2, a pace where you can still talk)Strong evidence
  • About 75 minutes a week of vigorous work such as high-intensity intervalsStrong evidence
  • Strength training 3 times a weekStrong evidence
  • Balance, flexibility and mobility work included in the daily sessionSome evidence
  • 2–3 minutes of light movement every 30 minutes of sitting, plus two 10-minute walks a daySome evidence
  • He says even 20 minutes of exercise a day is worthwhile for people starting outNote

Eating

Rangan Chatterjee

  • Eat within a 12-hour window (for example 8am to 8pm), leaving about 12 hours a day without foodSome evidence
  • Five portions of different vegetables every dayStrong evidence
  • Around eight glasses of water a dayPersonal habit
  • Eat at least one meal a day at a table, with no phone or device nearbyPersonal habit
  • No fixed protein target in the sources we checkedNote

Bryan Johnson

  • About 2,250 kcal a day, which he describes as roughly 10% below his energy needsSome evidence
  • About 130 g protein a day, much of it from plant foods, protein powders and collagenPersonal habit
  • Lots of vegetables, legumes (black lentils, chickpeas), berries, nuts and extra-virgin olive oil (about 1 tbsp per meal)Strong evidence
  • All food eaten between about 5:30 am and noonPersonal habit
  • Stops drinking fluids at about 4 pm to avoid waking at nightPersonal habit
  • Follows no named diet; he says he avoids labels such as vegan or ketoNote

Supplements

Rangan Chatterjee

No specific guidance in what we reviewed.

Bryan Johnson

  • Creatine, 7.5 g a day in totalSome evidence
  • Omega-3 (EPA/DHA), 800 mg a daySome evidence
  • Fibre-type prebiotics (inulin, galacto-oligosaccharides, arabinogalactan) in his morning drinkPersonal habit
  • Ashwagandha and rhodiolaPersonal habit
  • Blueprint's own multi-ingredient capsules and antioxidant softgelsPersonal habit
  • Collagen powder; he suggests 20–30 g a day for skin and hairPersonal habit

Sleep & recovery

Rangan Chatterjee

  • A tech-free wind-down before bed, ideally about 90 minutesSome evidence
  • Set a cut-off for work email in the evening (e.g. 8–8:30pm)Personal habit
  • Avoid emotionally charged topics, such as money worries, late in the eveningPersonal habit
  • Get daylight or time in nature in the morning, even five minutes, to help set the body clockSome evidence

Bryan Johnson

  • Fixed early schedule: in bed about 8:30 pm, up about 4:30 amStrong evidence
  • Screens off and a 60-minute wind-down before bedSome evidence
  • No caffeine for 8–10 hours before sleepSome evidence
  • Bright light soon after waking and dim red or amber light in the eveningSome evidence
  • Dry sauna at about 79 °C for 20 minutes dailySome evidence
  • Tracks sleep with a wearable and aims for a very low resting heart rate before sleepPersonal habit

Stress & mind

Rangan Chatterjee

  • A daily stillness practice, starting with two minutes of meditationSome evidence
  • 3-4-5 breathing: in for 3, hold for 4, out for 5, for about five minutesSome evidence
  • One full screen-free day a weekPersonal habit
  • Before bed, write down three things that went well and whySome evidence
  • Five minutes a day enjoying natureSome evidence

Bryan Johnson

  • Uses a fixed routine so daily health choices do not depend on willpowerPersonal habit
  • Breathwork or reading as part of the evening wind-downSome evidence

Weak spots to know

Rangan Chatterjee

  • The 4 pillar approach is broad, sensible lifestyle advice, but the evidence behind specific claims is mixed; for example, a large trial found a daily eating window added no significant weight loss on top of cutting calories.
  • Some targets are round rules of thumb rather than research-based numbers: the 10,000-step goal is higher than where the benefit levels off for people over 60 (about 6,000–8,000), and eight glasses of water a day is a convention, not a tested target.
  • He has commercial ties alongside his health advice: books, an app and a paid community, and since 2023 an advisory role with Levels, a glucose-monitoring company.

Bryan Johnson

  • His results come from one person doing many things at once, so it is hard to tell which part works. Scientists including Nir Barzilai (Nature, republished by Scientific American, 2026), who said science can't rest on a single person, and Morgan Levine (quoted in Vice, reported by Lifespan.io, 2023) have made this point.
  • His 'speed of ageing' and biological-age figures come from epigenetic clocks and biomarker comparisons. Researchers such as Steve Horvath have noted that some of these clocks predict health outcomes less well than others, and none is yet proven as a measure of whether a treatment extends life.
  • Several therapies he has tried, such as young-donor plasma and rapamycin, he later dropped himself. The US FDA has warned that young-plasma infusions have no proven benefit and may cause harm.

Build a plan from Chatterjee, Johnson or both

Your free plan shows a week of gym sessions, cardio, a day of eating, supplements and mobility, fitted to your age, time and health.

Plan in Chatterjee's stylePlan in Johnson's styleMix both

Questions

What is the main difference between Rangan Chatterjee and Bryan Johnson?

Their training split differs most in aerobic base (zone 2): Chatterjee about 50%, Johnson about 40% (our estimate from their published routines). Chatterjee's signature habit is Relax · eat · move · sleep; Johnson's is Sleep-first, measure everything.

How much protein do Chatterjee and Johnson recommend?

Chatterjee: No fixed target. Johnson: ~130 g a day.

Whose advice has stronger evidence?

We rate the evidence behind Chatterjee's protocol higher: solid, against mixed for Johnson.

Do Chatterjee and Johnson disagree?

Not directly in what we reviewed. Their differences are in emphasis: chatterjee puts more of the week into aerobic base (zone 2): about 50% against 40%.

Can I combine Chatterjee and Johnson?

Yes. In Build my mix you choose one expert per area, for example one for strength and another for eating. Your free plan shows the result straight away.

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Full sources are on each profile: Rangan Chatterjee · Bryan Johnson. Reviewed October 2026.